Are carbon-based anode and nickel-based cathode supercapacitors a bottleneck?

Extensive research has been conducted on supercapacitors composed of carbon-based anode materials paired with nickel-based cathode materials, yielding significant advances. However, the limited specific capacitance of carbon-based materials has been a bottleneck, restricting the overall energy density of these devices.

Are nickel-based electrodes symmetric supercapacitors?

Nickel-based electrode materials, in contrast, offer high-specific capacitance—a feature not inherent in carbon materials. Consequently, there has been a surge in research efforts aiming to construct symmetric supercapacitors using high-capacity nickel-based compounds and their composites.

Are asymmetric supercapacitors based on nickel-based cathode materials better?

In summary, asymmetric supercapacitors based on nickel-based cathode materials have made significant performance advancements compared to symmetric ones. However, challenges remain. Devices with carbon-based anode materials, despite their good rate performance, suffer from insufficient energy density.

What is the market share of supercapacitors in 2024?

By configuration, Electric Double-Layer Capacitors led with 55.2% of the supercapacitors market share in 2024, while Hybrid Supercapacitors are projected to expand at an 18.1% CAGR through 2030. By form factor, modules commanded 57.8% share of the supercapacitors market in 2024, and packs are forecast to grow at 17.4% CAGR to 2030.

How can nickel-based supercapacitors improve performance?

Although numerous strategies, such as hierarchical structure design, component optimization, and hybridization, have been deployed to overcome the limitations of nickel-based supercapacitors and have notably enhanced their performance, challenges persist (Fig. 8).

How much is the supercapacitors market worth in 2025?

The supercapacitors market is valued at USD 0.54 billion in 2025 and is projected to double to USD 1.09 billion by 2030.